Discussion
Which process sharpens a temperature gradient into a front?
Answer: C
A deformation field with its axis of dilatation at a suitable angle to the isotherms concentrates them, and the resulting frontogenesis is what creates the sharp gradients observed. Confluence and differential vertical motion contribute similarly. Radiative cooling and subsidence act too slowly and too broadly, while turbulent mixing acts to weaken gradients rather than to sharpen them.
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